using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Text (UGUI) 组件扩展类
/// 功能
/// 实现文字过长省略号显示
/// </summary>
public static class TextExtension
{
    //  operating in no overflow (Horizonal|Vertical)
    public static void SetTextWithEllipsis(this Text textComponent, string value)
    {
        // create generator with value and current Rect
        var generator = new TextGenerator();
        var rectTransform = textComponent.GetComponent<RectTransform>();
        var settings = textComponent.GetGenerationSettings(rectTransform.rect.size);
        generator.Populate(value, settings);

        // truncate visible value and add ellipsis
        var characterCountVisible = generator.characterCountVisible;
        var updatedText = value;
        if (value.Length > characterCountVisible)
        {
            updatedText = value.Substring(0, characterCountVisible - 1);
            updatedText += "…";
        }

        // update text
        textComponent.text = updatedText;
    }

    /// <summary>
    ///  Unity 2019 版本以上
    /// </summary>
    /// <param name="textComponent"></param>
    /// <param name="value"></param>
    public static void SetTextWithEllipsis(this Text textComponent, string value, int characterVisibleCount)
    {

        var updatedText = value;

        // 判断是否需要过长显示省略号
        if (value.Length > characterVisibleCount)
        {
            updatedText = value.Substring(0, characterVisibleCount - 1);
            updatedText += "…";
        }

        // update text
        textComponent.text = updatedText;
    }
}